Looking at comments below - is it possible to connect multiple (5) of these to an Arduino Mega?
13375
Its easy to connect 2. Jump the ADO line to +5V changes the address of the board. Do 2 of them, with different addresses, can exist on the same I2C line. More than 2 may be more difficult.
13376
Yes. It uses an i2c interface, so it is technically possible to assign them different addresses and talk to them individually. I don't know anyone who has done that before though.
13377
You can't do more than two unless you have two different TWIs. The address for this chip is programmable to two distinct addresses through AD0 by pulling it high or low. The Arduino Mega uses either an ATmega1280 ot ATmega2560, right? Both those chips have only one TWI. Looks like the max you can have on one Arduino Mega is 2.
1095735
I don't know how many can connect at the same time. I seen about 4 connecting. I have 12 set up.
1920578
You can hook them in series or parallel. I do believe your output will change though, not sure.
1212326
As all of the others have attested, the display will not work with the UNO for the reasons they have listed: program space, pin availability, etc. The Mega would be sufficient, however I used this screen with the Arduino Due. There were libraries for the Due and plenty of program space, pins, etc.
1585459
You could wire up switches to control each relay. You would supply 5 volts to the corresponding pin for a given relay you want to activate via individual switches. But the best use for this board is to let an Arduino or similar micro controller operate it. That is its intended usage.
666922
Can't fully answered your question. But realize these are not sold in pairs. Cheaper way is to get the superchips module. Problem solved(that's what I did)
1034762
The simple answer is Yes, however, it would not be easy. You could use jumpers from the header on the display to the pins on the MEGA, but this would be cumbersome. There is a map of the pins so it can be done. The best way is to use a shield designed for the display and the MEGA, this way all of the pins are mapped correctly.
657043
I *think* they are for external power as you suggested. It would be useful when many relays were operated and their current exceeded the Arduino's power supply regulator circuit capability. I am running two 8-relay boards off the Arduino 5v but am careful to only operate 3-4 at a time. The Arduino forum may have additional insights. If using external power be careful not to exceed arduino's output pin voltage and current sink capabilities.
1676725
Your question is not clear. If you mean can 1 remote transmitter control 5 receiver modules than yes. You would have 5 sets of 4 relays. Relay A on each board would open and close at the same time, same for relays B, C, and D. This assumes the 5 boards are all within about 100 foot of the remote. You would need to buy 5.
441704
I would say not, 3 inputs and 1 out! You need to look for a 1 in x 2 or more out or something similar.
1339734
No, that required individually addressable LEDs, and those can get quite expensive. If you're looking for that, I suggest looking on Adafruit for an Arduino and addressable LED light strips. You'll have to do a bit of programming and soldering, but the results can be pretty amazing!The controller for this set does have a flash and a fade mode (where they all flash/fade the same color).
924530
I can't answer about Arduino. I am using the PicAxe which can directly switch 12 volts, but can't handle any significant load. I run 5v to the logic side and run 12 volts to the control side of the picaxe. I also push the outputs to this board to switch other 12, 24 and. 110v circuits with higher loads. I will directly push LED circuits with the PicAxe and low load 12v.
852840
I used my board with an Arduino (5V) and used a separat 5V source. It may work with a Pi (3.3V) logic but for best results you may still need a 5V supply.
539581
I assume you are referring to FTDI's USB-UART board, in which case the answer is yes. This device is a USB-UART as well and can be used for the same purposes (including programming Arduinos w/o USB)
1300323
it says five but the one i have only has 4 outputs! and one is used forinput or Uplink
380377
i found this here for it i haven't tried it out yet but looks promising. http://www.raspberrypi.org/forums/viewtopic.php?f=63&t;=46949
750057
I don't see why not I know you can put more than one in a circuit but not sure the max that would probably strengthen the entire connection but you'd have to get all the clone buttons within 20 seconds or you'll find yourself with 6 different networks in your house